Ch 9 Coordination Compounds NCERT Solutions Class 12 Chemistry

Explain the bonding in coordination compounds in terms of Werner’s postulates.
Answer
Werner’s postulates explain the bonding in coordination compounds as follows:
(i) A metal exhibits two types of valencies namely, primary and secondary valencies.
Primary valencies are satisfied by negative ions while secondary valencies are satisfied by both negative and neutral ions.
(In modern terminology, the primary valency corresponds to the oxidation number of the metal ion, whereas the secondary valency refers to the coordination number of the metal ion.
(ii) A metal ion has a definite number of secondary valencies around the central atom.
Also, these valencies project in a specific direction in the space assigned to the definite geometry of the coordination compound.
(iii) Primary valencies are usually ionizable, while secondary valencies are non-ionizable.

NCERT Solutions For Class 12 Chemistry

• Chapter 1 The Solid State
• Chapter 2 Solutions  
• Ch 3 Electro chemistry
• Chapter 4 Chemical Kinetics  
• Chapter 5 Surface Chemistry
• Ch 6 General Principles and Processes of Isolation of Elements
• Chapter 7 The p Block Elements
• Chapter 8 The d and f Block Elements
• Ch 9 Coordination Compounds
• Chapter 10 Haloalkanes and Haloarenes
• Chapter 11 Alcohols Phenols and Ethers
• Ch 12 Aldehydes Ketones and Carboxylic Acids
• Chapter 13 Amines
• Chapter 14 Biomolecules
• Ch 15 Polymers
• Chapter 16 Chemistry in Everyday Life

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